Previous seasonal flu infections and vaccinations may protect us against infection from the highly pathogenic H5N1 bird flu outbreak.

Doctors say the case of a teen left in critical condition shows H5N1 "can cause severe human illness." Mutations in the virus are deepening concerns about the spread of H5N1.

The virus in the first severe human bird flu case in the U.S. was found to have mutated. Newsweek's live blog is closed.

Exclusive reporting reveals how the United States lost track of a virus that could cause the next pandemic. Problems like the ...

When, where and how the H5N1 bird flu virus may evolve and its capacity to spark a pandemic is hard to predict — in part, ...

A state of emergency has been declared in California, United States after cases of bird flu were observed in dairy cows in the state. As the country detected its first severe case of bird flu recently ...

After a strain of virus associated with avian flu ... raises new questions about the virus, which has spread for years in wild birds, commercial poultry and many mammal species. Since Type A ...

Beyond the bird flu, the federal government’s handling of the outbreak reveals cracks in the U.S. health security system that would allow other risky new pathogens ... any kind of reset in ...

“So that also raises challenges for testing this kind of vulnerable population ... Pigs, she explained, can carry both bird and human influenza viruses which creates a “mixing pot” that can lead to ...

The virus, also known as Type A H5N1, was detected for the first time in U.S. dairy cattle in March. Since then, bird flu has been confirmed in at least 866 herds in 16 states. More than 60 people ...

Wholesale egg prices up 150% from a year ago Bird flu outbreak accelerating in egg ... but they may lift prices in the new year, said Karyn Rispoli, Expana's managing editor for eggs.